97ae8a9dc6
Change-Id: Ic230d62fd36183379b3f3d7ee2006f6d143ca95a Implements: blueprint support-linux-bridge-on-neutron
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173 lines
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..
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This work is licensed under a Creative Commons Attribution 3.0 Unported
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License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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..
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==========================================
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Support linux bridge on neutron helm chart
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==========================================
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Blueprint:
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support-linux-bridge-on-neutron_
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.. _support-linux-bridge-on-neutron: https://blueprints.launchpad.net/openstack-helm/+spec/support-linux-bridge-on-neutron
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Problem Description
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===================
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This specification will address enablement of LinuxBridge network virtualization
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for OpenStack Helm (OSH). LinuxBridge is second available networking technology
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in Neutron's reference architecture. The first one is OVS, that is already
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implemented in OSH.
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The LinuxBridge (LB) is Neutron's L2 agent, using linux kernel bridges as network
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configuration for VMs. Both OVS and LB are part of Neutron's Modular Layer 2 (ML2)
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framework, allowing to simultaneously utilize the variety of layer 2 networking
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technologies.
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Other services inside Neutron reference stack (L3/DHCP/metadata agents) are
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dependent on L2 connectivity agent. Thus, replacing OVS with LB would cause
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changes in mentioned services configuration.
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Proposed Change
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===============
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LinuxBridge installation with neutron chart takes advantaged of decomposable
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neutron chart in OSH. LinuxBridge agent will be added as daemonset, similarly
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how OVS is implemented. New value :code:`daemonset_lb_agent` should be added in
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:code:`neutron/values.yaml` in :code:`manifests` section:
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.. code-block:: yaml
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manifests:
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(...)
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daemonset_dhcp_agent: true
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daemonset_l3_agent: true
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daemonset_lb_agent: false
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daemonset_metadata_agent: true
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daemonset_ovs_agent: true
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daemonset_ovs_db: true
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daemonset_ovs_vswitchd: true
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(...)
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By default, :code:`daemonset_lb_agent` will be set to false to remain default
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behaviour of installing OVS as networking agent.
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Installing OVS requires Kubernetes worker node labeling with tag
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:code:`openvswitch=enabled`. To mark nodes where LB should be used, new tag
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will be introduced: :code:`linuxbridge=enabled`.
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LinuxBridge should support external bridge configuration, as well as auto
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bridge add mechanism implemented for OVS.
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As mentioned before, configuration of L3/DHCP/metadata agent should be adjusted
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to use LinuxBridge, sample configuration override:
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.. code-block:: yaml
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conf:
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neutron:
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default:
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agent:
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interface_driver: linuxbridge
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ml2_conf:
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ml2_type_flat:
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neutron:
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ml2:
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mechanism_drivers: linuxbridge, l2population
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dhcp_agent:
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default:
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neutron:
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base:
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agent:
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interface_driver: linuxbridge
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l3_agent:
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default:
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neutron:
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base:
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agent:
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interface_driver: linuxbridge
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Having services configured, also the services pod dependencies should be
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updated to reflect the new kind on L2 agent:
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.. code-block:: yaml
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dependencies:
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dhcp:
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daemonset:
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- lb-agent
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metadata:
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daemonset:
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- lb-agent
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l3:
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daemonset:
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- lb-agent
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LinuxBridge should be also enabled in :code:`manifests` section:
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.. code-block:: yaml
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manifests:
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daemonset_lb_agent: true
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daemonset_ovs_agent: false
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daemonset_ovs_db: false
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daemonset_ovs_vswitchd: false
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In above example OVS and Neutron OVS agent are disabled.
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Another place where Neutron L2 agent should be pointed is dependencies list
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in other OpenStack projects. Currently, :code:`nova-compute` has dependency for
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:code:`ovs-agent` in :code:`nova/values.yaml`, it should be changed to:
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.. code-block:: yaml
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dependencies:
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compute:
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daemonset:
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- lb-agent
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Security Impact
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---------------
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No security impact.
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Performance Impact
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------------------
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VM networking performance would be dependent on linux bridge implementation.
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Alternatives
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------------
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OVS is an alternative in Neutron reference architecture. It is already in tree.
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Implementation
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==============
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Assignee(s)
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-----------
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Primary assignees:
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* korzen (Artur Korzeniewski)
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Work Items
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----------
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#. Add LinuxBridge daemonset
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#. Add gate job testing VM network connectivity
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#. Add documentation on how to use LinuxBridge
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Testing
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=======
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Gate job testing VM network connectivity.
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Documentation Impact
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====================
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Documentation on how to use LinuxBridge with Neutron chart.
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References
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==========
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